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Broad beans are the vegetable that keeps giving: sown in autumn they crop in early summer, they fix their own nitrogen, and a single row yields more weight than almost anything else of the same footprint. They are also cheap to start — a packet of seed costs less than a supermarket punnet of the same beans.
Their one real weakness is wind. Plants reach a metre or more, the stems are hollow and top-heavy with pods, and a gust at the wrong moment flattens the row. Stake them early and the rest of the season looks after itself.
Quick answer
Sow broad beans 5 cm (2 in) deep and 23 cm (9 in) apart, either in late autumn (October–November) for an early crop or in spring (February–April). They germinate in two to three weeks and need staking before they reach 60 cm. Water well once flowers set, pinch out the growing tips when pods form to deter blackfly, and harvest three to four months after sowing while the scar on each bean is still white. Mature plants leave nitrogen in the soil for the next crop.
| At a glance | Details |
|---|---|
| Botanical name | Vicia faba — also called fava bean or faba bean |
| Family | Fabaceae; fixes nitrogen at the roots |
| Hardiness | Hardy annual — survives most winters |
| Height | 90–150 cm (3–5 ft); pod-heavy plants need support |
| Pods | 15–20 cm (6–8 in), 4–6 flat oval seeds each |
| Light | Full sun, sheltered from wind |
| Soil | Rich, well-drained, manured the previous autumn |
| Sowing | Oct–Nov or Feb–Apr, 5 cm deep, 23 cm apart |
| Germination | 2–3 weeks at about 12°C (54°F) |
| Harvest | 3–4 months after sowing, bottom of the plant first |
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What Broad Beans Are
Broad bean is a bushy, hardy annual in the legume family, related to peas and runner beans rather than to the snap beans in the next bed. Plants grow 90–150 cm tall on square, hollow stems with leaves divided into leaflets, and carry white flowers splotched with brown. The pods run 15–20 cm long and hold four to six flat, oval seeds that can be white, yellow, green or pinkish-red depending on variety.
Because they are hardy, they occupy ground over winter that would otherwise be empty, and come out in time for a summer crop. That winter occupancy is the single biggest reason to grow them.
Nitrogen Fixation: What It Means in Practice
Broad beans form nodules on their roots and pull nitrogen out of the air, which is why they never need a nitrogen feed. While the plant is growing, that nitrogen goes into pods and stems. When it dies back at the end of the season, the roots release what is left into the soil for whatever follows.
Two practical points follow. First, don't feed them — extra nitrogen gives leaf and few pods. Second, leave the roots in the ground when you clear the plants: cut the stems at soil level and compost them, but don't pull the root ball out. More on the mechanism in nitrogen fixation in broad beans.
Choosing a Site and Preparing the Soil
Pick a well-drained bed in full sun, sheltered from the prevailing wind — a hedge, a fence or a wall on the exposed side is worth more than any stake. Dig it over and work in garden compost or well-rotted manure ahead of sowing, ideally in autumn so it settles.
Heavy clay is the one soil that causes trouble: beans sown into cold, waterlogged ground rot before they emerge. If that sounds like your plot, either sow in modules and plant out, or work in grit and compost to open the surface. A well-rotted chicken manure dressing the previous autumn is the traditional preparation.
Watch: Adding Manure to the Bed
How much well-rotted manure to work in, and when to do it.
Prefer YouTube? Watch it there.
When to Sow Broad Beans
There are two windows, and they produce quite different crops.
- Autumn sowing, October to November — while the soil still holds some warmth. Hardy varieties overwinter as small plants and crop roughly a month earlier than spring sowings. Expect some losses in a hard winter.
- Spring sowing, February to April — the safer option. February sowings usually want cloches over them; from March onward they can go in unprotected.
Cloches are worth the fuss for early sowings: they warm the soil before you sow and protect the seedlings through the coldest weeks.
Sowing Broad Beans Outdoors
- Draw a drill 5 cm (2 in) deep, or make individual holes with a dibber.
- Space seeds 23 cm (9 in) apart within the row, with 60 cm between rows.
- Drop one seed per station — orientation does not matter.
- Cover and water well, then leave the surface alone.
- Expect two to three weeks to germination. If nothing appears after four, mice have probably had the seed.
- Protect the row with fleece or netting if mice or pigeons are a problem on your plot.
Watch: How to Sow Broad Bean Seeds
Depth, spacing and the drill, filmed at the bed.
Prefer YouTube? Watch it there.
Starting Broad Beans Indoors
Modules or deep pots avoid the mouse problem entirely and give you plants to fill gaps. Fill a 7 cm pot with moist multipurpose compost, make a hole about 4 cm (1½ in) deep, drop a seed in, cover and firm. Label with variety and date. Keep them cool — around 12°C (54°F) is ideal, and a cold frame is better than a warm windowsill, which produces soft, leggy plants. Move them into good light the moment they break the surface.
Plant out once the roots fill the pot, after hardening them off over about a week. Broad beans are tougher than most, but a sudden frost on soft indoor growth still sets them back.
Supporting Broad Beans
Broad beans top out around 90–150 cm and the pods make the top heavy, so a windy site flattens them. The simplest system is one cane per plant, pushed in deep, with the stem tied in loosely at two points. For a whole row, drive canes at both ends and run string along the row at 45 cm and 90 cm to cage the plants in.
Put the supports in before the plants reach 60 cm. Trying to stake a leaning row after a gale is a losing game — the stems snap rather than bend.
Caring for Broad Beans
Watering
Keep the ground moist, and pay particular attention once flowering starts — that is when a dry spell costs you pods. Water at the base rather than over the foliage, and mulch to hold moisture.
Pinching out the tips
When the first pods set, nip out the top 10 cm or so of each stem, taking the growing tip and the top pair of leaves. Black bean aphid colonises soft new growth above everything else, and removing the tip removes their preferred real estate before the colony establishes. It also encourages the plant to put energy into filling pods rather than growing taller.
Feeding
None. The plants fix their own nitrogen; a feed does more harm than good.
Pests and Diseases
Black bean aphid
Dense black colonies smother the soft tips in late spring. Pinching out the growing tips is the main defence; for heavy infestations, a spray of soapy water or simply cutting off the infested tip is enough. Ladybirds and hoverflies usually arrive and do the rest.
Mice
Mice dig up freshly sown seed, and the damage is hard to diagnose because nothing appears above ground. Sowing in modules and planting out, or covering the row with fleece, removes the problem.
Chocolate spot
Dark brown spots and blotches on the leaves, worst in wet seasons, and it can kill plants. Space rows for airflow, avoid overhead watering, and destroy badly infected plants rather than composting them.
Harvesting Broad Beans
Broad beans are ready three to four months after sowing, and they ripen from the bottom of the plant upward, so you get several pickings rather than one. Pick when the beans are visible through the pod and the pod still feels firm.
There is one reliable test: look at the scar where the bean attached — the hilum. While it is white, the bean is tender. Once it turns black, you have left it too long and the bean will be starchy and tough. Pick by pulling downward with a slight twist, and hold the stem with the other hand so it does not tear.
Watch: How to Harvest Broad Beans
Pod size, the hilum test, and picking without damaging the stem.
Prefer YouTube? Watch it there.
Are Broad Beans Good for You?
Broad beans are a good source of plant protein and fibre, and they contain potassium in useful amounts. They also contain L-dopa, the precursor used in Parkinson's medication — which sounds dramatic but matters practically in only one way: anyone taking a MAO inhibitor should avoid them, because the combination can raise blood pressure.
One more caveat worth knowing: a minority of people, mostly of Mediterranean and Middle Eastern descent, carry G6PD deficiency, for whom broad beans can trigger haemolytic anaemia. If you do not know you carry it, you almost certainly do not. For everyone else they are a thoroughly ordinary, healthy vegetable.
Watch: Home-Grown Broad Bean Health Benefits
What is actually in a broad bean, and why fresh matters.
Prefer YouTube? Watch it there.
Broad Beans: Frequently Asked Questions
When should I plant broad beans?
Either October to November for an early crop, or February to April for a safer one. Autumn sowings need a hardy variety and may lose some plants to a hard winter.
How deep and how far apart do you sow broad beans?
5 cm (2 in) deep and 23 cm (9 in) apart, with about 60 cm between rows. One seed per station is enough.
How long do broad beans take to grow?
Two to three weeks to germinate, then three to four months to harvest. Autumn-sown crops are usually a month ahead of spring ones.
Do broad beans need support?
Yes. Even short varieties flop in wind once the pods fill. Put a cane beside each plant, or run string along the row, before the plants reach 60 cm.
Why are my broad bean plants covered in black flies?
Black bean aphid, which colonises the soft growing tips. Pinch out the top 10 cm of each stem when pods set, and remove any infested tips as soon as you see them.
Should I pinch out the tops of broad beans?
Yes, once the first pods have set. It removes the aphids' preferred feeding site and puts the plant's energy into filling pods rather than growing taller.
How do I know when to pick broad beans?
Check the scar on the bean, the hilum. White means tender; black means the bean has turned starchy and you have waited too long.
How many times can you harvest from one plant?
Several. Pods ripen from the bottom of the plant upward, so pick low down first and work up over a few weeks.
Do broad beans need fertilizer?
No. They fix their own nitrogen, and feeding nitrogen produces leaf rather than pods. Compost or manure dug in the previous autumn is all they need.
What should I plant after broad beans?
Anything that wants nitrogen. Cut the stems at soil level, leave the roots in the ground, and follow with leafy crops such as cabbage, spinach or lettuce.
Final Thoughts
Broad beans are the crop I would put in any new vegetable plot first, because they do three jobs at once: they fill the ground over winter, they crop heavily in early summer when little else is ready, and they leave the soil better than they found it. The only thing they demand is a cane and a bit of string.
The two mistakes that ruin a row are sowing into cold, wet soil and leaving the plants unstaked until the first gale. Fix both and broad beans look after themselves.
More Bean and Broad Bean Guides
- How to Grow Beans: Pole, Bush and Drying Types
- How to Harvest Broad Beans
- Growing Broad Beans in Containers
- Nitrogen Fixation in Broad Beans
- Home-Grown Organic Broad Beans
- How to Grow Black Turtle Beans
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